Absolute high spectral resolution measurements of surface solar radiation for detection of water vapour continuum absorption

The radiative calibration process using an ultra-high-temperature blackbody and the consideration of the related influence factors results in a radiatively calibrated measurement of the solar irradiation at the ground across the IR region from 2000 to 10 000 cm−1 with an uncertainty of between 3.3 and 5.9 per cent.